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Vibration motor

Inactive Publication Date: 2009-10-08
MINEBEA MOTOR MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]In view of the above, it is an object of the present invention to provide a vibration motor capable of stably rotating to generate vibration without causing an increase in a cogging phenomenon and without the need for providing an eccentric weight outside a motor frame.
[0020]With the above configurations, the vibration motor is capable of stably rotating to generate vibration without causing an increase in the cogging phenomenon and without the need for providing the eccentric weight outside the motor frame.

Problems solved by technology

Such configuration presents a problem that the eccentric weight is mounted outside a motor frame and, therefore, when the vibration motor is embedded in the portable communication device or the like, it is necessary to form an appropriate gap in a portion around the eccentric weight, which, as a result, causes complicated design.
However, in the configuration as disclosed in Patent References 1 and 2 in which one of the three salient poles is removed, there is a problem that a cogging phenomenon increases and actually the motor would not rotate or sufficient output from the motor can not be obtained.

Method used

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Examples

Experimental program
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first embodiment

[0043]Now, referring to FIGS. 1 through 6B, description is made about a motor with a commutator as a vibration motor according to a first embodiment of the present invention.

[0044]FIG. 1 is a schematic axial cross-sectional view of the motor with a commutator (hereinafter referred to simply as “motor” as appropriate) 1 according to the first embodiment of the present invention.

[0045]FIG. 2 is a schematic radial cross-sectional view of the motor 1 shown in FIG. 1, taken from line I-I of FIG. 1.

[0046]In the motor 1, a commutator unit 3 and an armature core 2 are mounted on a rotary shaft 5thereby constituting a rotor as a whole. The rotary shaft 5 is detachably disposed and rotatably supported via bearings 8 attached to a frame 6. Magnets 7 are attached to the frame 6 thereby constituting a stator as a whole.

[0047]The armature core 2 is configured such that a required number of magnetic plates each having punched three salient poles are stacked on one another, and only two out of the ...

second embodiment

[0056]Next, referring to FIGS. 7 through 9, description proceeds to a motor with a commutator as a vibration motor according to a second embodiment of the present invention.

[0057]FIG. 7 is a schematic axial cross-sectional view of the motor with a commutator 101 according to the second embodiment of the present invention.

[0058]In the second embodiment, components similar to those of the first embodiment are designated by like reference numerals and their detailed descriptions are omitted accordingly.

[0059]According to the second embodiment, a weight 109 serving as an eccentric weight to vibrate the motor 101 is secured to the rotary shaft 5 not by itself but by means of a weight holding member 112 provided separately from the weight 109.

[0060]FIG. 8 is a perspective view of the weight 109 shown in FIG. 7 seen from above, and FIG. 9 is a perspective view of the weight holding member 112 shown in FIG. 7 seen from below.

[0061]Referring to FIG. 8, the weight 109 includes a semi-cylindri...

third embodiment

[0074]Next, referring to FIGS. 10 through 12, description proceeds to a motor with a commutator as a vibration motor according to a third embodiment of the present invention.

[0075]FIG. 10 is a schematic axial cross-sectional view of the motor with a commutator according to the third embodiment of the present invention.

[0076]In the third embodiment, components similar to those of the first embodiment are designated by like reference numerals and their detailed descriptions are omitted accordingly.

[0077]According to the third embodiment, a weight 209 serving as an eccentric weight to vibrate a motor 201 is secured to the rotary shaft 5 not by itself but by means of a weight holding member 212 provided separately from the weight 209.

[0078]FIG. 11 is a perspective view of the weight 209 shown in FIG. 10 seen from above, and FIG. 12 is a perspective view of the weight holding member 212 shown in FIG. 10 seen from below.

[0079]A material for the weight 209 is determined by giving priority ...

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Abstract

A vibration motor includes a rotary shaft, an armature core secured to the rotary shaft and having a plurality of salient poles, an armature coil wound around each of the salient poles except at least one salient pole, a frame serving as an outside cover, a plurality of magnets secured to the frame and having respective different polarities, and a weight adapted to rotate together with the rotary shaft and disposed eccentrically, wherein the weight is disposed inside the frame and secured to the armature core in such a manner that at least a part of the weight is inserted in a hollow provided in at least the one salient pole having no armature coil.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a vibration motor, and in particular to a vibration motor to be used for providing a physical sensation in a portable communication device such as a mobile phone and a PHS (Personal Handy-phone System) and a game device.[0003]2. Description of the Related Art[0004]For notifying a user of an incoming call in communication devices such as a mobile phone, two methods are available. In one method, sound is generated at the time of receiving the incoming call to acoustically inform the user of the incoming call, and in the other method, vibration is generated by a built-in vibration motor to physically inform the user of the incoming call. These two methods are both incorporated in the communication devices and can be switched over as appropriate.[0005]Also, in order to enhance entertaining property in game devices, some game devices transfer vibration generated in steps with progresses of ga...

Claims

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Application Information

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IPC IPC(8): H02K7/075
CPCH02K7/063
Inventor MATSUBARA, MASAAKI
Owner MINEBEA MOTOR MFG
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